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Definition of atom : 1. A constituent particle of matter, or a molecule supposed to be made up of subordinate particles.
2. An ultimate indivisible particle of matter.
3. An ultimate particle of matter not necessarily indivisible; a molecule.
4. Anything extremely small; a particle; a whit.
5. The smallest particle of matter that can enter into combination; one of the elementary constituents of a molecule.
6. To reduce to atoms.

Synonyms:

dribble, scruple, fleck, blood corpuscle, snip, subatomic particle, blood cell, pinch, nubbin, snippet, chain, subdivision, division, piece, instalment, atomic, mote, atomic weight, portion, a bit, cation, atomic number, jot, molecule, patch, tinge, alpha particle, section, soupcon, segment, member, constituent, hint, anion, antiparticle, taster, atomic mass, sample, fraction, corpuscle, ingredient, fragment, component, atomic energy, a little, share, pinpoint, nugget, part, tittle

granule, bit, mite, smidgen, shred, scrap, dash, pittance, smithereen, dab, crumb, iota, touch, grain, trace, morsel, speck, whit, drop, flyspeck, modicum, particle

entireness, intactness, singleness, purity, union, embodiment, congruence, identity, simplicity, coherence, solidarity, fundamentality, indivisibility, entirety, coincidence, integrity, congruity, sameness, homogeneity, element, holism, unity, completeness, cohesion, oneness

Usage examples:

• And it was not an atom of good worrying herself as to whether Miss Tibbutt had been right or wrong regarding the idea communicated in her letter. - "Antony Gray,--Gardener", Leslie Moore.
• It's funny how he always seems the tiniest atom strange with her as if he didn't know her very well or hadn't known her very long. - "This Freedom", A. S. M. Hutchinson.
• You didn't guess the least little atom what we were doing, did you? - "The Head Girl at the Gables", Angela Brazil.